Water Health Check Report

Tucson, AZ

City of Tucson · Groundwater source

92

Excellent

0 EPA violations
1 above EWG guideline

Score methodology →
EPA · AZ0410112UCMR5 PFAS data included732,906 people servedLast updated Oct 2025
EPA UCMR5 · October 2025EPA SDWIS · January 2021

Excellent — with 1 concern

City of Tucson meets all federal legal limits but 1 contaminant exceeds EWG health guidelines. Lead levels within limits at treatment plant

Lead levels within limits at treatment plantAll contaminants within federal legal limits

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Contaminants tested

31 total · 1 above EWG guideline
ContaminantLevelStatus
8.1 ppt
Above guideline
Lithium

CAS 7439-93-2

21.4 ppb
Within limits
Fluoride

CAS 16984-48-8

ND ppm
Within limits
ND ppb
Within limits
ND NTU
Within limits
Copper

CAS 7440-50-8

ND ppm
Within limits
Chlorine (residual)

CAS 7782-50-5

ND ppm
Within limits
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
ND
Not detected
LegendWithin limitsAbove EWG guidelineAbove EPA limitNot detectedSource: EPA SDWIS · UCMR5 · EWG Health Guidelines

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Data sources

EPA UCMR5 (PFAS + lithium)·October 2025·One-time programme 2023–2025
EPA SDWIS compliance data·January 2021·Annual reporting cycle

Status flags compare detected levels against both EPA legal limits and EWG health-based guidelines—which are stricter and science-derived, independent of political feasibility.